Researchers are claiming in a newly released study that prior infection with COVID-19 offers long-lasting and comprehensive immunity against severe and fatal cases of the disease.
The study, published online at medRxiv and not yet subject to peer review, was performed by a team of researchers largely based out of Qatar. The scientists in the preprint noted that “the future of the SARS-CoV-2 pandemic hinges on virus evolution and duration of immune protection of natural infection against reinfection.”
They noted that, while immunity derived from “natural infection” offers a relatively quickly waning protection against re-infection, the durability of natural immunity against severe reinfections was robust and long-lasting.
“Protection of natural infection against reinfection wanes and may diminish within a few years,” the researchers observe in the paper, while “protection against severe reinfection remains very strong, with no evidence for waning, irrespective of variant, for over 14 months after primary infection.”
“Effectiveness of primary infection against severe, critical, or fatal COVID-19 reinfection was 97.3%” over that time period, the paper states.
The researchers to gather their data studied “duration of protection afforded by natural infection, the effect of viral immune evasion on duration of protection, and protection against severe reinfection, in Qatar, between February 28, 2020 and June 5, 2022.”
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